食管腐蚀伤后4周出现吞咽困难逐渐加重，可认为是() ["A．食管腐蚀伤进入缓解期","B．食管异物","C．残留的腐蚀剂进一步破坏食管壁","D．食管腐蚀伤进入瘢痕狭窄期","E．食管腐蚀伤后并发食管炎症"]
患者60多岁，男性，胸部不适加重，最可能的诊断为() ["A．食管癌","B．肺癌","C．主动脉瘤破裂","D．淋巴瘤","E．以上都不是"]
患支气管淋巴结结核的小儿，肿大淋巴结压迫可出现哪些情况() ["A．喘鸣","B．肺不张","C．痉挛性咳嗽","D．肺气肿","E．声嘶"]
该新生儿右下肺团块，CT血管造影提示诊断为() ["A．假性囊肿","B．肺隔离症","C．肺炎","D．动静脉畸形","E．以上都不是"]
呼吸功能失常
简述气管切开术在治疗下呼吸道分泌物潴留中的作用。
